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Background: Postponement of childbearing since the 1970s has led to an increase in permanent involuntarily childlessness. We will address the magnitude of this trend, the effect of IVF/ICSI and the effect on total fertility rate (TFR an often used demographic measure for the level of fertility) in six EU countries., Methods: Using a fertility micro-simulation model, we estimate the effect of postponement of first motherhood on permanent involuntary childlessness in six representative European countries since 1970/1985: Sweden, Austria, Czech Republic, The Netherlands, West Germany and Spain. To estimate the effect of IVF/ICSI on this trend, we use data on the results of all IVF/ICSI cycles performed in The Netherlands in 2003 and 2004., Results: Permanent involuntary childlessness approximately doubled since 1970s and rose to ~4% in the Czech Republic and to ~7% in Spain with the other countries in between. If all couples entitled to have IVF/ICSI were to be treated, the effect of postponement would almost have been neutralized. However, only a limited proportion of eligible couple are being treated. Without postponement, TFRs would have been between 0.03 and 0.05 higher., Conclusions: The effect of postponement on permanent involuntary childlessness is considerable. So far IVF/ICSI only had a slight effect on this trend. The impact of postponement on TFRs is small compared with other demographic trends.